Process of making ferrous carbonate.



UNITED I ST ADOLF FIIUGGE, ()l! HANOVER, GERMANY.

PROCESS OF MAKING FERROUS.CARBONATE.

Specification of Letters Patent.

Patented Jan. 29, 1907.

Application filed November 16, 1906. Serial No. 343,531.

To all whorl t it may concern.-

Be it known that l, AnoLr FLUGUE, phar-,

maceutical chemist, and a resident of 4 IJZLVQS" strasse, Hanover, Kingdom of Prussia, (xerman Empire, have invented new and useful Improvements in Processes for the Manufacture of Pure Ferrous Carbonate, of which the following is a specification.

The manufacture of ferrous carbonate in the cold, according to this invention, rests upon the observation that the alkaline bicarbonates are able to convert powdered Ferrous sulfate completely into ferrous carbonate with formation of alkali sulfate when the said powder is intimately ground with the alkali carbonate in glycerin or sugar solution.

For the purpose of the manufacture powdered ferrous sulfate from which all air has been expelled previously by means of carbon dioxid is ground with some glycerin or simple syrup to a thin paste, and to the latter the necessary alkali carbonate, also free from air, is added gradually with constant stirring until the reactionthat is to say, the evolution of carbon dioxidhas ceased. For the bicarbonate there -may be substituted in part the normal carbonate. One hundred parts of owdered' ferrous sulfate require about eig ity parts of potassium or sodium bicarbonate. The reaction may be expressed by the following equation;

reso, enkeo,

FcCQ, K,so, me co,

rating the tate insoluble in nitric acid. The mass, consisting of ferrouscarbonate and alkali sulfate, 1s mixed wlth sulhcient water previously saturated with carbon (lioxid to dissolve the alkali sulfate. The whole is allowed to settle in order to render the precipitate of ferrous carbonate somewhat denser. The supernatant liquid is removed as complctelyas possible, and the precipitate is introduced into the centrifugal machine in order to separate the residual liquid fron'i the ferrous carbrmate by centrifugal force. I t is necessary to use water saturated with carbon dioxid in order to pro;

vent oxidation. of the ferrous carbonate by' atmospheric a'r.

By the foregoing process there is obtained in the shortest and. cheapest manner a forrous carbonate completely free from objection and having a greenish-white color and a microscopical degree of fineness Which'is useful medieinally.

- N ow what 1 claim, and desire to secure by Letters Patent, is the following:

1.. A process for the manufacture of pure ferrous carbonate, which process consists in grinding powdered ferrous sulfate free from air with alkali carbonate free from air with a syrupy liquid in the cold, then mixing the mass with water saturated with carbon dioxid to dissolve the alkali sulfate, and finally se arating the ferrous carbonate from the so ution by scttlingand centrifugal action.

2. A process for the manufacture of .pure ferrous carbonate, which process consists in grinding one hundred parts of powdered ferrous sulfate free from air with eighty; parts of alkali bicarbonate free from air and glycerin in the cold, then mixing the mass with water. previously saturated with carbon. dioxid to dissolve the alkali sulfate, and finally sepafer ous carbonate from the solution by settling and centrifugal action.

.ln testimony that I. claim the foregoing as my invention 1 have signed my name, in presence of two witnesses, this 2d day of N ovember, 1906.

ADOLF FLUGGE.

Witnesses: N

KARL LEIsN R, 1.. it. 'lnoMPsoN. 

